This is a quick and easy test that measures malondialdehyde in the urine. Aldehydes are released into the bloodstream when fats, including cell membranes, are oxidized. The kidneys excrete them in the urine. Thus Meta-Oxy is a general measure of cell membrane oxidation due to free radical peroxidation of lipids. Test is 50 times more accurate than blood testing. Meta-Oxy bulk 25 pack.